Vintage German Planisphere Astronomy DRP Registered O/1118 only ident RARE

Description

Planisphere labeled in German.
10.5" diameter. Single overlay with a clear circular area within a darker clear area. Overlay, as noted, spins via the tab.
The only non-stellar text is near April -  "DRP. angemeldet DRGM angemeldot", and a O/1118 somewhat below both. DRP signifies "Deutsche Reich Patent" and DRGM a similar registration.
All books shipped in protective cardboard, or better.
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(G08U-.3)